DEVELOPMENT OF SHEAR WAVE VELOCITY EXPLORATION SYSTEM BASED ON MICROTREMOR MEASUREMENTS AND IT'S APPLICATION TO SITE CHARACTERISTCS

基于微动测量的剪切波速度探测系统开发及其在场地特征中的应用

• 批准号: 10555197
• 负责人: TOKIMATSU Kohji
• 金额: $ 3.46万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10555197/
• 关键词: Microtremors; Two-dimensional; Shear wave velocity profile; Earthquake; Array observation; Rayleigh waves; Dispersion curve; Dynamic response characteristics; レイリー波

The objects of this study is to develop a technique for estimating shear wave velocity structures using both the dispersion characteristics and the H/V spectra that can readily be obtained from microtremor measurements and to examine it's application for the evaluation of dynamic response characteristics of a site. For this purpose, (1), analytical formulas are presented for computing the H/V ratios of microtremors, assuming, that microtremors consist of Rayleigh and surface waves, (2) an inverse analysis using H/V spectra is developed for estimating a shear wave velocity structure under appropriate constraint conditions, (3) a theory and a field technique as well as observation system are introduced for estimating two-dimensional shear wave velocity structure using both microtremor dispersion curve and H/V spectra, (4) the effectiveness of the proposed method is examined based on microtremor measurements at sites for which shear, wave velocity structure is available, and (5) dynamic r … More esponse analyses are conducted using the two-dimensional shear wave velocity structures that are estimated from the proposed method for the regions where either strong motion array records or spatial variation of damage was obtained during the Kushiro-oki and Hyogoken-Nambu earthquakes.It is shown that:(1) The H/V ratios of surface waves are in fairly good agreement with those of microtremors;(2) VィイD2sィエD2 profiles of subsurface soils may be estimated from the H/V ratios of microtremors using the proposed formulas,.(3) The microtremor measurements in Kushiro and Kobe confirm the effectiveness of the proposed method for outlining three-dimensional soil profiles with varying thickness of surface layer overlying bedrock, and(4) The computed spatial variation in acceleration from two-dimensional shear wave velocity structures estimated from microtremors are consistent with those observed in the field, indicating that the effectiveness of an economical means of estimating two- or three-dimensional shear structure Less

本研究的目的是开发一种技术，用于估计剪切波速度结构使用的频散特性和H/V谱，可以很容易地从微动测量获得，并检查它的应用程序的评价的动态响应特性的网站。为此，（1）假定地脉动由瑞利波和面波组成，提出了计算地脉动H/V比的解析公式;（2）在适当的约束条件下，提出了用H/V谱估计剪切波速度结构的反分析方法，（3）介绍了利用地脉动频散曲线和H/V谱估计二维剪切波速度结构的理论、现场技术和观测系统，（4）在有剪切波速结构的场地上，利用地脉动观测资料检验了所提出方法的有效性;（5）在有剪切波速结构的场地上，利用地脉动观测资料检验了动力响应的有效性。 ...更多信息 用本文方法估计的二维剪切波速度结构，对串冲地震和兵库县南部地震中有强震台阵记录或震害空间变化的地区进行了响应分析，结果表明：（1）面波的H/V比与地震动的H/V比相当一致;（2）利用本文提出的公式，可以从地脉动的H/V比值估算地下土壤的V_（？）(3)通过对钏路和科比的地脉动观测，验证了本文方法在基岩上覆土层厚度变化情况下的三维土壤剖面的有效性。（4）由地脉动估算的二维剪切波速度结构计算得到的加速度空间变化与现场观测结果一致。这表明，有效的经济手段，估计二维或三维剪切结构减

项目成果

Tokimatsu, K., Sekiguchi, T., and Abe, A.: "Effects of Hidden Valley on Ground Response and Damage Distribution in the 1993 Kushiro-oki Earthquake"12WCEE. (CD-ROM) No. 2232. 8 (2000)

Tokimatsu, K.、Sekiguchi, T. 和 Abe, A.：“1993 年钏路冲地震中隐谷对地面响应和损害分布的影响”12WCEE。

Kohji TOKIMATSU: "Three-Dimensional Soil Stratification Using Surface Waves in Microtremors" Proc.The 1st International conference on Site Characterization-ISC98. 537-542 (1998)

Kohji TOKIMATSU：“利用微震中的表面波进行三维土壤分层”Proc.第一届现场表征国际会议 -ISC98。

Hiroshi ARAI: "Evaluation of local site effects based on microtremor H/V spectra"Proc, The 2nd International Symposium on the effects of surface Geology on seismic Motion. 673-680 (1998)

Hiroshi ARAI：“基于微动 H/V 谱的局部场地效应评估”Proc，第二届地表地质对地震运动影响国际研讨会。

Tokimatsu, K. and Arai, H.: "Evaluation of Local site Effects Based on Microtremor H/V Spectra"Proc. The 2nd International Symposium on the Effects of Surface Geology on Seismic Motion. 673-680 (1998)

Tokimatsu, K. 和 Arai, H.：“基于微震 H/V 频谱的局部场地效应评估”Proc。

Kohji TOKIMATSU: "Two-Dimensional Shear Wave Structure and Ground Motion Characteistics in Kobe Based on Microtremor Measurements" ASCE,Geotechnical Earthquake Engrang.and Soil Dynamics 3rd Conf.Vol.2. 703-713 (1998)

Kohji TOKIMATSU：“基于微震测量的神户二维剪切波结构和地面运动特征”ASCE、岩土地震 Engrang. 和土壤动力学第 3 届会议第 2 卷。